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Fuel tank pressurising - Possible Causes

 
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Padde



Joined: 04 Aug 2016
Posts: 4
Location: East of England

PostPosted: Sat Mar 18, 2017 1:37 pm    Post subject: Fuel tank pressurising - Possible Causes Reply with quote

Could anyone please advise as to possible causes for fuel tank pressurising?

Thank you.
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Romadog2004



Joined: 06 Aug 2008
Posts: 549
Location: Warwickshire

PostPosted: Sat Mar 18, 2017 2:01 pm    Post subject: Reply with quote

So when fuel cap is removed , there is a release of air then??
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Padde



Joined: 04 Aug 2016
Posts: 4
Location: East of England

PostPosted: Sun Mar 19, 2017 9:42 am    Post subject: Fuel tank pressurising Reply with quote

Thank you, yes, there is a release of air when the fuel cap is removed; it is definitely not a vacuum issue. Any ideas as to the cause?
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Romadog2004



Joined: 06 Aug 2008
Posts: 549
Location: Warwickshire

PostPosted: Sun Mar 19, 2017 10:55 am    Post subject: Reply with quote

Breather to expansion tank under r/h rear wheel may be blocked - check.
I have this as I am using a multi vent tank in my 110 with the vents blocked off as expansion tank is NLA at Land Rover. Not been a problem so far......
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Padde



Joined: 04 Aug 2016
Posts: 4
Location: East of England

PostPosted: Sun Mar 19, 2017 3:52 pm    Post subject: Thanks for Advice re Fuel Tank Pressurising Reply with quote

Thank you very much, I'll check the vent.
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gilmore



Joined: 01 Feb 2012
Posts: 96

PostPosted: Thu Mar 23, 2017 7:55 pm    Post subject: Reply with quote

Mine does this. Makes a hissing sounds when I unscrew the cap. I could have sworn I've seen a post on this board a couple of years ago that said that it's totally normal and meant to so that.
I'll have a search...
regs
rob
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gilmore



Joined: 01 Feb 2012
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PostPosted: Thu Mar 23, 2017 8:01 pm    Post subject: Reply with quote

Couldn't find any reference to it. I must have been drunk.
regs
rob
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Padde



Joined: 04 Aug 2016
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Location: East of England

PostPosted: Thu Mar 23, 2017 8:17 pm    Post subject: Fuel Tank Pressurising Reply with quote

Thanks Rob,
It's reassuring to hear that other people seem to have a pressurising fue tank but what concerns me is that it didn't used to do it so I am wondering if there is a problem of feedback from the ECU or a blocked charcoal filter as I have seen on American (Rover) V8 blogs.
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gilmore



Joined: 01 Feb 2012
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PostPosted: Thu Mar 23, 2017 9:03 pm    Post subject: Reply with quote

Hmmm. Interesting. Mine seems to run fine like it is.

I'll keep an eye on this thread if anyone has any further info.
cheers
rob
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Crocs



Joined: 30 Sep 2013
Posts: 226

PostPosted: Mon Mar 27, 2017 4:32 pm    Post subject: Reply with quote

Probably totally unrelated but I used to have a Mk2 Jag that did this. Engine would even cut out after a while.

Renewed the filler cap and sorted!

Robert
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Romadog2004



Joined: 06 Aug 2008
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Location: Warwickshire

PostPosted: Mon Mar 27, 2017 5:13 pm    Post subject: Reply with quote

Robert

You may have a point ???????
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gilmore



Joined: 01 Feb 2012
Posts: 96

PostPosted: Tue Jul 25, 2017 5:44 pm    Post subject: Reply with quote

I tried a different filler cap and the original. Both vent into the tank to allow air in to replace the fuel as it's used, not out into atmosphere. However, I'm pretty sure the air hisses out of the tank when I open the cap to fill up. I'm baffled. She seems to run OK.
thanks
rob
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50Def



Joined: 15 Jan 2016
Posts: 22

PostPosted: Mon Aug 07, 2017 6:10 pm    Post subject: Reply with quote

My Defender 50th does the same as does my V8i Discovery. I have always assumed its normal. Both cars run fine.
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